<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
		 var str="hello,";
		 str=str.concat("js");
		 //alert(str);//substr,substring
		 var s2=String.fromCharCode(21016,65,66,67);
		 console.log(s2);
		</script>
	</head>
	<body>
	</body>
</html>
